What are the size limitations for using a trench box?

The correct choice emphasizes the importance of ensuring that a trench box is appropriately sized for the specific excavation it is placed in. A trench box, or trench shield, is designed to provide protection to workers in excavations from the walls of the trench collapsing. It must fit both the depth and width of the excavation safely.

Being appropriately sized is crucial to prevent any risk of crushing or injury. If a trench box is too small, it might not provide adequate support to the trench walls, thereby exposing workers to the dangers of cave-ins. Conversely, if it's oversized or improperly fitted, it may not offer the necessary stability and could potentially cause safety hazards as well.

Overall, ensuring that a trench box fits the excavation safely is a fundamental aspect of excavation safety practices, as it directly relates to protecting workers and maintaining the integrity of the excavation site.